As an active pro electric vehicle community member, I am always on the scout for electric motors that can be used for Ev conversions.
In this video, i had a series wound dc motor for 150usd and tuned it up to a smooth running an efficient motor just like a Tesla motor for model S or the first roadster (smiles).
This video covers the tune up and all the corrections to its performance now in the class of Netgain Warp 9 DC motors.